how to service a baxi duotec 1 or HEA

[Billy Bob Bob]

note you dont need to do this every year but the customer wanted a new seal (friends of theres has a vailant melt) now firstly its assumed your not a halfwit and have isolated the gas and electric first so if you electrocute yourself or blow the house up its your problem
1,remove combustion door
2,disconect the gas to manifold nut
3,remove the spark,detection and earth leads
4,remove the clear silicone equilibrium pressure tube note its position get it wrong and the boiler wont fire afterwards
5,remove the fan electrical connections
6,remove the 4 10mm front cover/hex nuts
7,carefully pull the whole assembly forwards the venturi will drop out of the gas to manifold connection keep this safe and dont forget to refit it

 

[Billy Bob Bob]

Re: how to service a duotec HEA

pour some water through the hex to make sure the condys clear,note the condition of the electrodes if they are bending they need replacing

 

[Billy Bob Bob]

Re: how to service a duotec HEA

closed thread may make it sticky

 

[Billy Bob Bob]

Re: how to service a duotec HEA

finally change the gasket,reassemble ,LDF both the gas to manifold nut and just in case the gas valve nut,put it into calibration mode and carry out a fga,PN of the gasket in the photo